"For tender burgers, gently combine and shape the chicken mixture...."
INGREDIENTS
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Olive oil (for brushing)
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1 cup mayonnaise
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1 1/4 cups chopped fresh basil plus 8 large leaves, divided
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3 tablespoons chopped drained cornichons or dill pickle plus 1 1/2 tablespoons brine from jar
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2 green onions, finely chopped
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1 1/4 pounds ground chicken
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4 1/2-inch-thick slices country white bread
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4 1/3-inch-thick slices from large red or orange heirloom tomato